New Bremen
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Bremen clear sky chart from 2005-11-06 to 2024-08-15.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	14% 10% 4 8% 5% 4 5% 4 6% 7% 33%	95352
	Night	15% 11% 4 8% 5% 4 4 3 5% 6% 35%	93345
Transparency	Day	49% 7% 11% 20% 12% 1	95116
	Night	49% 6% 11% 20% 12% 2	93187
Seeing	Day	18% 10% 26% 24% 15% 7%	15194
	Night	19% 9% 28% 28% 14% 2	24982

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	17% 17% 9% 12% 5% 5% 4 2 4 5% 19%	2527
	11th to 20th	Day	16% 18% 7% 12% 6% 5% 8% 5% 4 4 15%	2561
	21st to end	Day	27% 20% 9% 12% 5% 3 3 2 3 4 12%	3124
February	1st to 10th	Day	18% 17% 6% 12% 6% 5% 4 2 5% 5% 21%	1769
	11th to 20th	Day	15% 12% 5% 14% 7% 4 5% 3 4 5% 25%	1848
	21st to end	Day	16% 16% 4 9% 5% 5% 4 3 4 7% 27%	1570
March	1st to 10th	Day	21% 19% 5% 9% 4 4 4 3 3 5% 22%	3142
	11th to 20th	Day	13% 10% 3 7% 5% 4 5% 4 6% 7% 37%	3480
	21st to end	Day	19% 11% 4 10% 5% 5% 4 4 5% 6% 28%	3815
April	1st to 10th	Day	14% 11% 4 10% 6% 5% 4 4 5% 6% 31%	2251
	11th to 20th	Day	18% 8% 3 7% 5% 5% 4 4 5% 7% 35%	2329
	21st to end	Day	19% 9% 3 8% 5% 5% 4 4 5% 8% 31%	2470
May	1st to 10th	Day	20% 10% 3 8% 5% 5% 5% 3 6% 7% 29%	4082
	11th to 20th	Day	20% 7% 2 5% 4 4 5% 4 6% 7% 37%	4081
	21st to end	Day	9% 6% 2 7% 5% 5% 5% 4 8% 10% 37%	4476
June	1st to 10th	Day	13% 6% 2 6% 5% 5% 5% 4 7% 8% 40%	2576
	11th to 20th	Day	10% 5% 2 6% 5% 4 6% 4 7% 10% 42%	2660
	21st to end	Day	9% 5% 2 6% 5% 4 6% 6% 8% 10% 38%	2660
July	1st to 10th	Day	12% 7% 2 7% 5% 4 5% 5% 7% 11% 35%	4440
	11th to 20th	Day	7% 4 2 5% 4 4 4 4 7% 12% 46%	4440
	21st to end	Day	8% 6% 3 7% 5% 5% 6% 5% 7% 10% 38%	4466
August	1st to 10th	Day	8% 5% 2 5% 4 4 5% 5% 8% 10% 45%	2457
	11th to 20th	Day	9% 5% 1 6% 5% 5% 5% 5% 8% 10% 41%	2357
	21st to end	Day	9% 5% 2 7% 4 4 5% 4 7% 11% 44%	2433
September	1st to 10th	Day	12% 6% 2 5% 5% 4 4 3 5% 7% 46%	2057
	11th to 20th	Day	10% 6% 2 6% 5% 4 4 4 7% 8% 44%	1980
	21st to end	Day	16% 6% 2 5% 4 4 3 3 4 6% 46%	1980
October	1st to 10th	Day	12% 6% 3 8% 4 5% 4 3 5% 7% 43%	1980
	11th to 20th	Day	15% 7% 2 6% 4 4 4 4 5% 7% 41%	1814
	21st to end	Day	20% 10% 3 8% 5% 5% 5% 4 6% 6% 30%	1820
November	1st to 10th	Day	10% 8% 2 6% 3 3 3 3 5% 6% 49%	1672
	11th to 20th	Day	17% 12% 4 8% 5% 4 4 3 4 5% 34%	1710
	21st to end	Day	18% 15% 5% 9% 4 4 3 3 5% 5% 29%	1710
December	1st to 10th	Day	17% 18% 7% 11% 6% 5% 4 3 4 4 21%	1710
	11th to 20th	Day	15% 16% 6% 12% 6% 5% 5% 4 5% 4 23%	2122
	21st to end	Day	20% 22% 10% 13% 6% 5% 4 3 3 4 11%	2783
January	1st to 10th	Night	18% 17% 8% 13% 5% 5% 3 3 4 4 20%	4428
	11th to 20th	Night	14% 19% 9% 15% 6% 5% 5% 4 4 3 15%	4404
	21st to end	Night	27% 19% 7% 9% 4 4 3 3 3 4 16%	4532
February	1st to 10th	Night	21% 14% 5% 9% 6% 5% 4 3 4 5% 25%	2409
	11th to 20th	Night	13% 14% 5% 10% 6% 5% 4 3 5% 6% 29%	2218
	21st to end	Night	20% 13% 5% 10% 5% 5% 3 3 5% 5% 26%	1884
March	1st to 10th	Night	20% 14% 4 7% 4 4 3 2 4 5% 34%	3711
	11th to 20th	Night	12% 8% 3 6% 4 4 4 4 5% 7% 44%	3480
	21st to end	Night	18% 10% 4 7% 5% 4 4 2 4 5% 37%	3817
April	1st to 10th	Night	16% 10% 3 6% 5% 4 4 4 5% 7% 36%	1945
	11th to 20th	Night	17% 8% 2 7% 5% 4 5% 3 5% 8% 37%	1798
	21st to end	Night	18% 8% 3 7% 5% 4 4 3 6% 6% 36%	1710
May	1st to 10th	Night	19% 11% 4 8% 5% 4 5% 4 5% 7% 29%	2813
	11th to 20th	Night	19% 8% 2 5% 5% 3 4 3 6% 8% 37%	2812
	21st to end	Night	10% 6% 2 5% 4 5% 5% 4 7% 10% 43%	3079
June	1st to 10th	Night	8% 6% 3 6% 4 4 4 4 5% 9% 47%	1598
	11th to 20th	Night	9% 5% 2 5% 4 5% 4 5% 5% 10% 47%	1520
	21st to end	Night	8% 6% 2 5% 5% 4 4 4 6% 10% 45%	1520
July	1st to 10th	Night	10% 5% 2 6% 4 5% 5% 4 5% 9% 45%	2530
	11th to 20th	Night	6% 4 2 4 4 4 4 4 7% 10% 52%	2530
	21st to end	Night	10% 6% 2 6% 5% 5% 5% 3 7% 9% 43%	3085
August	1st to 10th	Night	7% 4 2 6% 5% 4 6% 4 7% 8% 47%	1701
	11th to 20th	Night	7% 5% 2 5% 5% 4 4 4 7% 8% 48%	1643
	21st to end	Night	7% 4 1 6% 4 5% 4 4 6% 8% 51%	1919
September	1st to 10th	Night	11% 6% 3 5% 3 3 4 4 5% 8% 49%	1884
	11th to 20th	Night	10% 6% 1 4 3 3 3 3 5% 7% 55%	1980
	21st to end	Night	10% 6% 2 6% 4 4 4 4 5% 7% 48%	1980
October	1st to 10th	Night	11% 5% 2 6% 3 4 4 3 5% 7% 50%	1980
	11th to 20th	Night	17% 9% 3 7% 4 4 4 3 4 7% 39%	2146
	21st to end	Night	20% 8% 2 7% 4 4 4 3 5% 6% 36%	2533
November	1st to 10th	Night	13% 9% 2 5% 4 3 3 3 6% 6% 46%	2406
	11th to 20th	Night	15% 12% 4 8% 4 4 3 3 6% 5% 35%	2470
	21st to end	Night	18% 14% 4 8% 6% 4 5% 4 4 5% 28%	2470
December	1st to 10th	Night	19% 15% 5% 9% 6% 4 3 4 4 6% 24%	2470
	11th to 20th	Night	18% 15% 7% 10% 5% 4 4 3 5% 4 26%	3056
	21st to end	Night	23% 20% 8% 11% 6% 4 4 3 4 4 15%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	67% 5% 7% 13% 8%	2528
	11th to 20th	Day	73% 4 10% 8% 5%	2561
	21st to end	Day	78% 3 7% 8% 3	3124
February	1st to 10th	Day	66% 4 10% 12% 8% 1	1769
	11th to 20th	Day	61% 4 10% 17% 7% 1	1858
	21st to end	Day	58% 5% 11% 16% 8% 2	1570
March	1st to 10th	Day	64% 5% 9% 15% 6%	3142
	11th to 20th	Day	45% 6% 10% 27% 11% 1	3480
	21st to end	Day	56% 6% 13% 19% 5%	3815
April	1st to 10th	Day	53% 6% 11% 18% 12%	2251
	11th to 20th	Day	47% 6% 12% 20% 12% 2	2329
	21st to end	Day	51% 7% 12% 18% 11% 2	2470
May	1st to 10th	Day	52% 8% 11% 20% 9% 1	4120
	11th to 20th	Day	45% 7% 14% 24% 9% 1	4085
	21st to end	Day	37% 11% 13% 22% 16% 2	4489
June	1st to 10th	Day	40% 7% 11% 24% 15% 2	2576
	11th to 20th	Day	36% 8% 13% 25% 16% 2	2660
	21st to end	Day	38% 9% 14% 21% 14% 4	2660
July	1st to 10th	Day	42% 7% 12% 22% 16% 2	4371
	11th to 20th	Day	29% 8% 14% 27% 21% 1	4365
	21st to end	Day	39% 8% 14% 19% 17% 3	4324
August	1st to 10th	Day	31% 9% 15% 28% 15% 1	2444
	11th to 20th	Day	36% 9% 13% 27% 13% 1	2357
	21st to end	Day	33% 8% 14% 24% 15% 5%	2433
September	1st to 10th	Day	37% 8% 12% 21% 19% 4	2057
	11th to 20th	Day	35% 8% 10% 24% 21% 2	1980
	21st to end	Day	39% 5% 10% 23% 21% 1	1980
October	1st to 10th	Day	40% 7% 10% 24% 18% 2	1980
	11th to 20th	Day	41% 6% 12% 22% 18% 2	1814
	21st to end	Day	52% 6% 11% 19% 10% 1	1820
November	1st to 10th	Day	36% 5% 13% 25% 19% 2	1672
	11th to 20th	Day	52% 5% 9% 20% 11% 3	1710
	21st to end	Day	57% 5% 10% 18% 9% 1	1710
December	1st to 10th	Day	66% 5% 10% 13% 5%	1710
	11th to 20th	Day	62% 5% 11% 16% 6%	2119
	21st to end	Day	79% 4 7% 6% 5%	2783
January	1st to 10th	Night	67% 5% 9% 13% 6%	4428
	11th to 20th	Night	73% 4 7% 11% 4	4404
	21st to end	Night	72% 4 8% 11% 4	4532
February	1st to 10th	Night	62% 5% 10% 14% 8% 1	2409
	11th to 20th	Night	56% 5% 11% 16% 11% 1	2219
	21st to end	Night	60% 5% 10% 15% 9% 2	1884
March	1st to 10th	Night	54% 4 8% 24% 10% 1	3711
	11th to 20th	Night	38% 7% 13% 27% 14% 2	3480
	21st to end	Night	49% 5% 11% 26% 9% 1	3817
April	1st to 10th	Night	46% 6% 12% 20% 14% 1	1945
	11th to 20th	Night	44% 8% 10% 18% 16% 3	1798
	21st to end	Night	48% 6% 10% 20% 13% 3	1710
May	1st to 10th	Night	53% 8% 9% 20% 9% 2	2840
	11th to 20th	Night	43% 8% 13% 26% 10% 1	2813
	21st to end	Night	32% 10% 14% 25% 16% 3	3087
June	1st to 10th	Night	33% 7% 11% 25% 21% 3	1598
	11th to 20th	Night	32% 8% 12% 26% 18% 3	1520
	21st to end	Night	33% 8% 15% 24% 17% 4	1520
July	1st to 10th	Night	36% 7% 11% 25% 16% 6%	2490
	11th to 20th	Night	27% 7% 15% 29% 21% 1	2482
	21st to end	Night	37% 6% 16% 19% 18% 5%	2987
August	1st to 10th	Night	32% 8% 14% 27% 18% 1	1690
	11th to 20th	Night	31% 8% 13% 28% 20% 1	1643
	21st to end	Night	29% 9% 14% 20% 22% 5%	1919
September	1st to 10th	Night	34% 7% 13% 24% 17% 5%	1884
	11th to 20th	Night	30% 5% 9% 29% 25% 2	1980
	21st to end	Night	34% 7% 10% 23% 23% 3	1980
October	1st to 10th	Night	33% 6% 12% 25% 23% 2	1980
	11th to 20th	Night	46% 5% 8% 24% 17% 1	2146
	21st to end	Night	48% 5% 9% 21% 14% 2	2533
November	1st to 10th	Night	39% 4 11% 23% 20% 2	2406
	11th to 20th	Night	48% 5% 10% 20% 14% 3	2470
	21st to end	Night	57% 5% 10% 19% 8% 1	2470
December	1st to 10th	Night	60% 6% 10% 16% 7%	2470
	11th to 20th	Night	60% 5% 10% 17% 7% 1	3058
	21st to end	Night	73% 5% 9% 9% 4	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	24% 20% 31% 20% 4	270
	11th to 20th	Day	27% 16% 39% 14% 4 1	270
	21st to end	Day	34% 15% 29% 16% 5%	297
February	1st to 10th	Day	31% 16% 32% 17% 3	270
	11th to 20th	Day	25% 19% 37% 13% 6%	270
	21st to end	Day	24% 17% 44% 14% 1	225
March	1st to 10th	Day	25% 18% 37% 17% 3	279
	11th to 20th	Day	26% 12% 32% 23% 6% 1	460
	21st to end	Day	30% 15% 28% 20% 6%	506
April	1st to 10th	Day	18% 19% 31% 21% 9% 2	460
	11th to 20th	Day	21% 18% 27% 21% 9% 4	452
	21st to end	Day	22% 12% 33% 21% 8% 2	460
May	1st to 10th	Day	24% 10% 34% 21% 8% 3	463
	11th to 20th	Day	23% 8% 25% 24% 13% 8%	487
	21st to end	Day	11% 7% 26% 28% 19% 10%	529
June	1st to 10th	Day	14% 6% 24% 32% 18% 7%	596
	11th to 20th	Day	10% 6% 23% 31% 22% 7%	680
	21st to end	Day	12% 5% 27% 28% 20% 8%	680
July	1st to 10th	Day	11% 3 18% 27% 22% 19%	671
	11th to 20th	Day	7% 4 20% 30% 25% 14%	668
	21st to end	Day	10% 2 17% 27% 27% 16%	532
August	1st to 10th	Day	9% 4 14% 25% 31% 16%	486
	11th to 20th	Day	11% 2 18% 31% 25% 13%	456
	21st to end	Day	9% 3 14% 28% 31% 15%	495
September	1st to 10th	Day	13% 4 14% 24% 31% 13%	450
	11th to 20th	Day	10% 3 14% 27% 30% 17%	450
	21st to end	Day	18% 9% 22% 21% 20% 10%	450
October	1st to 10th	Day	13% 6% 24% 29% 16% 12%	450
	11th to 20th	Day	17% 14% 32% 23% 12% 2	450
	21st to end	Day	28% 12% 33% 22% 4 1	335
November	1st to 10th	Day	16% 14% 36% 21% 9% 4	270
	11th to 20th	Day	24% 16% 29% 19% 11% 1	270
	21st to end	Day	27% 11% 41% 17% 3	270
December	1st to 10th	Day	21% 20% 35% 17% 6% 1	270
	11th to 20th	Day	21% 14% 43% 17% 4	270
	21st to end	Day	29% 20% 33% 15% 3	297
January	1st to 10th	Night	25% 15% 35% 19% 5%	950
	11th to 20th	Night	27% 14% 36% 18% 5%	927
	21st to end	Night	25% 13% 35% 23% 4	836
February	1st to 10th	Night	26% 11% 34% 25% 3	760
	11th to 20th	Night	21% 14% 38% 25% 2	743
	21st to end	Night	27% 13% 37% 21% 3	628
March	1st to 10th	Night	21% 13% 34% 24% 7% 1	760
	11th to 20th	Night	18% 15% 34% 26% 6% 1	760
	21st to end	Night	23% 13% 29% 26% 8%	836
April	1st to 10th	Night	20% 11% 33% 29% 5% 1	615
	11th to 20th	Night	21% 10% 31% 27% 9% 1	563
	21st to end	Night	21% 9% 35% 25% 9% 1	570
May	1st to 10th	Night	22% 8% 33% 27% 10% 1	570
	11th to 20th	Night	22% 4 26% 30% 16% 2	561
	21st to end	Night	9% 4 23% 37% 25% 3	617
June	1st to 10th	Night	10% 2 24% 42% 21% 1	570
	11th to 20th	Night	12% 3 21% 40% 24% 1	570
	21st to end	Night	9% 3 24% 36% 27% 2	570
July	1st to 10th	Night	11% 1 15% 37% 30% 6%	555
	11th to 20th	Night	8% 2 17% 39% 29% 5%	552
	21st to end	Night	10% 2 12% 41% 34% 2	624
August	1st to 10th	Night	9% 2 10% 41% 33% 4	567
	11th to 20th	Night	8% 2 12% 40% 33% 5%	549
	21st to end	Night	9% 2 11% 35% 37% 6%	594
September	1st to 10th	Night	13% 4 15% 33% 31% 4	624
	11th to 20th	Night	12% 3 14% 32% 34% 5%	720
	21st to end	Night	12% 5% 24% 32% 24% 3	720
October	1st to 10th	Night	13% 4 24% 33% 20% 5%	720
	11th to 20th	Night	23% 11% 27% 27% 12%	720
	21st to end	Night	24% 12% 31% 26% 7%	792
November	1st to 10th	Night	18% 9% 33% 26% 14% 1	740
	11th to 20th	Night	21% 15% 32% 25% 7% 1	760
	21st to end	Night	24% 14% 31% 25% 6%	760
December	1st to 10th	Night	26% 14% 33% 22% 5%	760
	11th to 20th	Night	25% 12% 34% 23% 5%	774
	21st to end	Night	29% 15% 33% 20% 3	1045

Page generated at 2024-08-12 09:52:48. Version ac07

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